问:经常看到书报刊上说“上世纪30年代中叶”“13世纪后半叶”等等,这些“叶”是什么意思?——四川周小明答:叶,本义是植物的营养器官之一,通常由叶片和叶柄组成,通称叶子。假借指“世”或“代”。《后 Q: I often see books and magazines that say “mid-30s of the last century”, “the second half of the thirteenth century” and so on, these “leaves” What does it mean? - Sichuan Zhou Xiaoming A: leaves, the original meaning is One of vegetative organs of plants, usually composed of leaves and petioles, commonly known as leaves. Under the guise of “world ” or “generation ”. "Rear